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pacome delva

New Material: Network of 'Streets' for Light - 1 views

  • In recent years, researchers have created early versions of "invisibility cloaks" and advanced optical fibers by manipulating light using structures composed of tiny, repeating units. In the 9 April Physical Review Letters, a team proposes a different way to make an artificial optical material--from a network of light-guiding filaments. If such structures are practical, they could open new ways to control light in technologies ranging from high-speed telecommunication to high-resolution imaging.
pacome delva

Novel negative-index metamaterial bends light 'wrong' direction - 1 views

  • the first negative index metamaterial to operate at visible frequencies
  • By engineering a metamaterial with such properties, we are opening the door to such unusual -- but potentially useful -- phenomena as superlensing (high-resolution imaging past the diffraction limit), invisibility cloaking, and the synthesis of materials index-matched to air, for potential enhancement of light collection in solar cells
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    I forwarded the link to my experimental colleagues and here is the comment from Sergei (the master himself:) "this is what Igor has been doing - an array of plasmonic nanocables. This basically works as a wire-medium slab. All their epsilon and mu are rubbish." * If Sergei is as strict as in this comment, then it IS rubbish. He's not one of the notorious complainer (as e.g. myself.) * Please DO NOT FORWARD this to anybody else, Sergei's comment is NOT FOR PUBLIC USE!
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    UPDATE: I had a short chat with Sergei and Pekka, Sergei noticed that there is an increasing number of papers on metamaterials, especially in Nature and Science, which are simply wrong, this one being an example. * The idea is based on a very well known effect of wired media. What appears to be interesting about this paper is that they manage to make an optical analogue with aparently low losses. This could be interesting. * The whole interpretation as NIM, "wrong" refraction etc. is total nonsense.
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    wow, good to know ! But for the privacy you should be aware that this is a public group, so anyone has access to our comments i think !
Juxi Leitner

Open Source Satellite Initiative | machine project - 3 views

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    All the satellite-related systems (except for the rocket to launch it) are DIY programs -- designed so that regular people may also have the chance of developing and eventually launching their own.
  • ...2 more comments...
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    The book is actually funny to read ... but this is not serious! Is it ?
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    I was saying that mainly because of some flaws - the piggy-pack installation, no dedicated stage, the limited control, ... It is so far very funny, but once he can fill all the gaps, it should be an excellent initiative - although careful about the debris if anyone has its own ;p
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    his quote: "when art becomes practical, we call it technology; when technology becomes useless, we call it art" ... this is probably the later one ....
Ma Ru

Sun For Everyun - 3 views

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    Nice initiative, isn't it?
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    some citizen science added to this would make it even better ... as it is it's rather, boh ...
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    Well, true - making data public is one thing, and making others to work through them for you is another... I love the new term "citizen science" though (and an explanation on the Wikipedia page why they had to invent a new one because "crowdsourcing" is soooooo - politically - wrong).
Luís F. Simões

The Space Age, as recorded on human written history - 4 views

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    Google Books measurements of word frequencies on 15 million books (12% of all the books ever published). More about it in:  - Google Opens Books to New Cultural Studies - John Bohannon, Science 2010-12-17 - Slashdot: Google Books Makes a Word Cloud of Human History - http://ngrams.googlelabs.com/info
Luís F. Simões

Polynomial Time Code For 3-SAT Released, P==NP - Slashdot - 0 views

  • "Vladimir Romanov has released what he claims is a polynomial-time algorithm for solving 3-SAT. Because 3-SAT is NP-complete, this would imply that P==NP. While there's still good reason to be skeptical that this is, in fact, true, he's made source code available and appears decidedly more serious than most of the people attempting to prove that P==NP or P!=NP. Even though this is probably wrong, just based on the sheer number of prior failures, it seems more likely to lead to new discoveries than most. Note that there are already algorithms to solve 3-SAT, including one that runs in time (4/3)^n and succeeds with high probability. Incidentally, this wouldn't necessarily imply that encryption is worthless: it may still be too slow to be practical."
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    here we go again...
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    slashdot: "Russian computer scientist Vladimir Romanov has conceded that his previously published solution to the '3 SAT' problem of boolean algebra does not work."
Joris _

Public asked to define a galaxy - 1 views

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    "collective wisdom" to define what a "galaxy" is. Is it really a good approach ? It does not seem any sociologist is involved in the process. http://arxiv.org/PS_cache/arxiv/pdf/1101/1101.3309v1.pdf
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    How about "collective wisdom" on what "stupid research" is?
Luís F. Simões

Peer review: Trial by Twitter : Nature News - 1 views

  • Blogs and tweets are ripping papers apart within days of publication, leaving researchers unsure how to react.
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    includes some discussion on the aftermath of NASA's arsenic paper
Luís F. Simões

Coding for Outer Space - A Programming Contest | Google Lunar X PRIZE - 1 views

  • This weekend, programmers from all over Europe will be gearing up to compete in the 5'th Catalysts Coding Coding Contest (CCC'11). This year, the theme is Astronautics.
  • The competition is also open to online participants.
  • Individuals or teams of up to three people will be given a series of challenging problems that must be solved as quickly as possible.
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  • As a contestant, you must conceive of a proper solution and produce the correct output in order to advance to the next level. How you get there is completely up to you. You may use any computational means at your disposal.
  • Online contestants will not be eligible for prizes – they compete for glory alone.
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    who is interested in following this a bit closer?
LeopoldS

Europe tackles huge fraud : Nature News - 5 views

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    they used names of scientists and research centres without these actually knowing about their involvement it seems.... I am wondering what they actually reported back in terms of results? randomly generated papers? Christos?
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    surprised? of course not! schadenfreude? yes, a lot!
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    Probably some bored project officer "accepted" the deliverables as reasonable? What worries me is the last paragraph by the Committee on Industry and Research (Space is in there..., all RTD is there...) Are we going to simplify procedures or tighten more??? Because there is a lot of talk about simplification in FP8: which is not well received by Parliament/Council and co...
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    Hopefully I'm wrong, but I'm very pessimistic. I guess they will impose even more control, ask for even more detailed description of the results that will be delivered and concentrate even more on project funding instead of funding open research.
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    maybe this is what happen when there is so much paper involved... a simple phone call to one of the research scientist and the fraud is unveiled :) or maybe the "bored project officer" has a brand new mercedes...
Luís F. Simões

Europe's Plan to Move An Asteroid - Technology Review - 3 views

  • In 2002, the European Space Agency began a program called Don Quijote to find out how best to perform such a deflection.
  • Now, Stephen Wolters at the Open University in the UK and a few friends have published a new analysis of the mission saying that measuring the change in orbit is not enough. Instead, the spacecraft needs to characterise the impact in detail, determining the density of the material near the asteroid's surface, the size of the surface grains as well as the mass and speed distribution of the impact ejecta.
  • Ref: arxiv.org/abs/1107.4229: Measurement Requirements For A Near-Earth Asteroid Impact Mitigation Demonstration Mission
Christos Ampatzis

Academic publishers make Murdoch look like a socialist - 4 views

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    Who are the most ruthless capitalists in the western world? Whose monopolistic practices make Walmart look like a corner shop and Rupert Murdoch a socialist? You won't guess the answer in a month of Sundays. While there are plenty of candidates, my vote goes not to the banks, the oil companies or the health insurers, but - wait for it - to academic publishers.
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    fully agree ... "But an analysis by Deutsche Bank reaches different conclusions. "We believe the publisher adds relatively little value to the publishing process … if the process really were as complex, costly and value-added as the publishers protest that it is, 40% margins wouldn't be available." Far from assisting the dissemination of research, the big publishers impede it, as their long turnaround times can delay the release of findings by a year or more." very nice also: "Government bodies, with a few exceptions, have failed to confront them. The National Institutes of Health in the US oblige anyone taking their grants to put their papers in an open-access archive. But Research Councils UK, whose statement on public access is a masterpiece of meaningless waffle, relies on "the assumption that publishers will maintain the spirit of their current policies". You bet they will. In the short term, governments should refer the academic publishers to their competition watchdogs, and insist that all papers arising from publicly funded research are placed in a free public database. In the longer term, they should work with researchers to cut out the middleman altogether, creating - along the lines proposed by Björn Brembs of Berlin's Freie Universität - a single global archive of academic literature and data. Peer-review would be overseen by an independent body. It could be funded by the library budgets which are currently being diverted into the hands of privateers. The knowledge monopoly is as unwarranted and anachronistic as the corn laws. Let's throw off these parasitic overlords and liberate the research that belongs to us."
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    It is a really great article and the first time I read something in this direction. FULLY AGREE as well. Problem is I have not much encouraging to report from the Brussels region...
Francesco Biscani

Found: first 'skylight' on the moon - space - 22 October 2009 - New Scientist - 2 views

  • A deep hole on the moon that could open into a vast underground tunnel has been found for the first time. The discovery strengthens evidence for subsurface, lava-carved channels that could shield future human colonists from space radiation and other hazards.
Joris _

The Space Review: Breaking up may be good to do - 6 views

shared by Joris _ on 03 Nov 09 - Cached
LeopoldS liked it
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    I especially like " The program will also create a "developer's kit" of open hardware and software specifications to make it easier for new components to integrate into such fractionated systems." Joris: wanna take the lead on having a closer look on this, I definitely would like to be part of it and happy to contribute, possibly also Juxi? - first assessment by Christmas realistic?
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    I think it a very interesting approach. If you google "darpa F6", you should see that a lot seems to be on-going. So, should we do something about it before having the conclusions of the Darpa study ?
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    wait and see is never a good approach in these cases .... first step has to be anyway to understand what they are up to and then to think about our own ideas on it, own approaches, alternatives and then to see what we can do specifically in the team on it.
Francesco Biscani

Apollo 11 Source Code on GoogleCode | Lambda the Ultimate - 0 views

  • TC BANKCALL # TEMPORARY, I HOPE HOPE HOPE CADR STOPRATE # TEMPORARY, I HOPE HOPE HOPE
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    Excellent comments from the Apollo original source code:)
LeopoldS

Virtual Teams - 0 views

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    this might come very handy in case we explore further the idea of a virtual ACT - one of the key points: you still have to meet from time to time physically ...
ESA ACT

Posts tagged BugLabs at Engadget - 0 views

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    look at these bugs .... can't we do something with them? they look nice for sure ....
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